Study on the Optimization of Coagulation Effect and Mechanism by Response Surface Methodology

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Study on the Optimization of Coagulation Effect and Mechanism by Response Surface Methodology

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[1]PENG Zhaoxu,JIANG Kun,LOU Tianyu,et al.Study on the Optimization of Coagulation Effect and Mechanism by Response Surface Methodology[J].Journal of Zhengzhou University (Engineering Science),2022,43(04):92-96.[doi:10.13705/j.issn.1671-6833.2021.05.019]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43卷 Number of periods: 2022 04 Page number: 92-96 Column: Public date: 2022-07-03

Title:: Study on the Optimization of Coagulation Effect and Mechanism by Response Surface Methodology

Author(s):: PENG Zhaoxu; JIANG Kun; LOU Tianyu; NIU Ningqi; Wang Ju; LI Lei; College of Water Conservancy Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

Keywords:: aluminum sulfate; coagulation optimization; response surface method; turbidity; fractal dimension

CLC:: X703. 1

DOI:: 10.13705/j.issn.1671-6833.2021.05.019

Abstract:: In order to investigate the comprehensive effects of pH value,coagulant and coagulant aid dosage,stirring strength,and flocculation time on the coagulation process,aluminum sulfate was used as coagulant and PAM as coagulant aid to treat kaolin raw water.Turbidity,average particle size and dimension of flocs were used as response values.The response surface method was used to optimize the coagulation conditions and analyze the coagulation mechanism.Finally,the regression model equation including all parameters was established.The results showed that when the turbidity of raw water was 95.47 NTU,the turbidity removal rate was 87.42% under the conditions of pH value of 8.00,aluminum sulfate dosage of 21.47 mg/L,PAM dosage of 5.75 mg/L,stirring intensity of 31.41 r/min and flocculation time of 19.37 min.It is found that the dosage (coagulant and coagulant aid) and pH value had the most significant influence on the coagulation effect,and played a decisive role in the morphology and structure of flocs.The stirring strength and flocculation time affected the formation rate and final morphology of flocs,whose influence was less than the former.Three parallel experiments were carried out under the optimal conditions,and the relative error between the actual turbidity and the predicted value is 2.66%,which indicated that the model had guiding significance for optimizing the working conditions and enhancing the coagulation effect in practical engineering.

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